[issue33332] Expose valid signal set (sigfillset()): add signal.valid_signals()

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

+    if (sigemptyset(&mask) || sigfillset(&mask)) {

I'm not sure that sigemptyset() is needed.

sigfillset() manual page:

       sigfillset() initializes set to full, including all signals.

The function is used to *initialize* a set.

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<https://bugs.python.org/issue33332>
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